This guide explains what a star really is in a simple, fun way for kids ages 8–12, with a free printable worksheet to explore further.
What is a star made of?
A star is an enormous ball of hot, glowing gas. Deep in its core, it makes its own light and heat by squeezing tiny bits of gas together — a process called fusion.
That's why stars shine so brightly across unimaginable distances of space.
Our Sun is a star
Here's a surprise: our own Sun is a star too! In fact, it's a fairly average, smallish one. It only looks huge and bright because it is by far the closest star to us.
All the other stars are suns as well — just much, much farther away.
How are stars born and how do they die?
Stars are born inside giant clouds of gas and dust called nebulae. They can shine for billions of years. As you can read in the life of a star, only the very biggest stars end their lives in a giant explosion called a supernova — our Sun is too small and will end quietly instead.
Huge numbers of stars gather together into galaxies, like our own Milky Way.
Explore the stars at home
Discover what makes stars shine in the What Is a Star? activity book, or explore the whole Space collection — with facts, activities and an Explorer Certificate.
A fun question to try on a grown-up: is the Sun a star — and is it a big star or a small one?